Wednesday 5 December 2012 20.01 EST
First published on Wednesday 5 December 2012 20.01 EST

A nationwide hunt is under way after a mother and her seriously ill seven-year-old son, who is in need of cancer treatment, went missing.

Sally Roberts, also known as Sally Leese, and her son Neon, are thought to have left their home town of Tiverton, Devon, on 3 December.

Last night Devon and Cornwall police launched an urgent appeal after growing concern for the health of the youngster, who has recently undergone surgery for a brain tumour. Doctors treating him said he is in need of urgent medical attention.

It is believed his mother is opposed to further treatment and has disappeared with him. Police are asking any members of the public who may have seen them or know where they are to come forward. There were unconfirmed sightings of the two in the Kent/Sussex area.

Assistant chief constable Chris Boarland said: "Neon is seriously ill and we have huge concern for his welfare.

"He is currently subject to a family court order and I would ask his mother to think about her son's welfare and contact police and medical services as soon as possible.

"Neon needs urgent medical attention and his wellbeing, along with his mother, is our prime concern.

"If any member of the public has seen Neon and Sally or knows their whereabouts they should contact police as a matter of urgency on 0800 0560154."